login

A147540 as a simple table

na(n)
15
2231
37967
4260223
58372735
6268306431
78588894207
8274869551103
98796026044415
10281474440364031
119007194961870847
12288230341800361983
139223371762010423295
14295147902980463788031
159444732948147641253887

[5,231,7967,260223,8372735,268306431,8588894207,
 274869551103,8796026044415,281474440364031,
 9007194961870847,288230341800361983,
 9223371762010423295,295147902980463788031,
 9444732948147641253887]